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EVOLUTION I

EVOLUTION I. e volution: -change over time E volution (Darwin’s Theory): -modern organisms came from ancient organisms. Darwin’s observations: -diversity in similar ecosystems -living organisms look like fossils -Galapagos Islands. Darwin’s Finches. -13 species  1 common ancestor

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EVOLUTION I

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  1. EVOLUTION I

  2. evolution: • -change over time • Evolution (Darwin’s Theory): • -modern organisms came from ancient organisms

  3. Darwin’s observations: • -diversity in similar ecosystems • -living organisms look like fossils • -Galapagos Islands

  4. Darwin’s Finches -13 species 1 common ancestor -uniquely adapted to its habitat -difference in beak shape & size

  5. Adaptation- inherited characteristic that increases an organism’s chance for survival • physical/behavioral

  6. Survival of the Fittest- individuals with the most successful adaptations survive and reproduce more successfully • Natural Selection- changes in the inherited characteristics of a population & increases a species’ fitness in its environment

  7. Fitness Ability to survive and reproduce!

  8. Checking For Understanding What is a polar bear’s white fur considered? ADAPTATION What is the ability to survive and reproduce considered? FITNESS

  9. Checking for Understanding What is this animal’s adaptation? Bill

  10. Checking for Understanding What is change over time? EVOLUTION Fill in the blank.. Darwin theorized that ____ organisms came from ancient organism. MODERN

  11. Checking for Understanding Darwin studied what kind of birds on the Galapagos Islands? FINCHES Changes in the inherited characteristics of an entire species is considered what? NATURAL SELECTION

  12. Evidence for Evolution • Turn to pg. 108 • Title the Page “Evidence for Evolution” • Divide the page into roughly 9 boxes. • Number the boxes 1-9.

  13. #1 • Fossil Record -evidence of changing life forms over millions of years

  14. #2 Homologous Structures-similar structures arising from a common ancestor

  15. #3 AnalogousStructures • Same function but no common ancestry

  16. #4 Checking for Understanding A human forearm to a cat’s forelimb is considered what? HOMOLOGOUS A butterfly’s wing to a bird’s wing is considered what? ANALOGOUS

  17. #5Similar Embryology: • Vertebrates form in the same way in early stages of development.

  18. #6-Vestigial Structures • No function, and resembled other organisms Ex: coccyx (human tail bone), Appendix

  19. #7Checking for Understanding What serves as evidence that life forms have been changing for millions of years? FOSSIL RECORD

  20. #8 Checking for Understanding What proves that vertebrates develop in the same way early on? SIMILAR EMBRYOLOGY

  21. #9 CLOSURE ACTIVITY How does an adaptation relate to survival of the fittest? Those most fit to survive has the most successful adaptations, otherwise inherited characteristics.

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